jdk8-mips64-public/hotspot: src/os/linux/vm/globals

8024838: Significant slowdown due to transparent huge pages
Summary: Don't turn on transparent huge pages (-XX:+UseTransparentHugePages) unless explicitly specified on the command line. This has the effect that large pages are never turned on Linux unless the user has explicitly enabled any of the large pages flags: -XX:+UseLargePages, -XX:+UseTransparentHugePages, -XX:+UseHugeTLBFS, and -XX:+UseSHM.
Reviewed-by: jwilhelm, tschatzl, brutisso

     1 /*

     2  * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  *

    23  */

    25 #ifndef OS_LINUX_VM_GLOBALS_LINUX_HPP

    26 #define OS_LINUX_VM_GLOBALS_LINUX_HPP

    28 //

    29 // Defines Linux specific flags. They are not available on other platforms.

    30 //

    31 #define RUNTIME_OS_FLAGS(develop, develop_pd, product, product_pd, diagnostic, notproduct) \

    32   product(bool, UseOprofile, false,                                     \

    33         "enable support for Oprofile profiler")                         \

    34                                                                         \

    35   product(bool, UseLinuxPosixThreadCPUClocks, true,                     \

    36           "enable fast Linux Posix clocks where available")             \

    37 /*  NB: The default value of UseLinuxPosixThreadCPUClocks may be        \

    38     overridden in Arguments::parse_each_vm_init_arg.  */                \

    39                                                                         \

    40   product(bool, UseHugeTLBFS, false,                                    \

    41           "Use MAP_HUGETLB for large pages")                            \

    42                                                                         \

    43   product(bool, UseTransparentHugePages, false,                         \

    44           "Use MADV_HUGEPAGE for large pages")                          \

    45                                                                         \

    46   product(bool, LoadExecStackDllInVMThread, true,                       \

    47           "Load DLLs with executable-stack attribute in the VM Thread") \

    48                                                                         \

    49   product(bool, UseSHM, false,                                          \

    50           "Use SYSV shared memory for large pages")

    52 //

    53 // Defines Linux-specific default values. The flags are available on all

    54 // platforms, but they may have different default values on other platforms.

    55 //

    56 define_pd_global(bool, UseLargePages, false);

    57 define_pd_global(bool, UseLargePagesIndividualAllocation, false);

    58 define_pd_global(bool, UseOSErrorReporting, false);

    59 define_pd_global(bool, UseThreadPriorities, true) ;

    61 #endif // OS_LINUX_VM_GLOBALS_LINUX_HPP

src/os/linux/vm/globals_linux.hpp@263f2c796d6c

src/os/linux/vm/globals_linux.hpp

Mercurial > jdk8-mips64-public > hotspot / file revision

src/os/linux/vm/globals_linux.hpp@263f2c796d6c

src/os/linux/vm/globals_linux.hpp